Topic

Data Structures & Algorithms

Real interview questions with expert answers, plain-English explanations, and practical examples. (17 questions)

Meta Data Engineer Data Structures & Algorithms

A Meta data pipeline processes real-time clickstream data, needing to identify unique visitors within a 15-minute rolling window. How would you design a data structure and algorithm to efficiently track unique visitor IDs, supporting both additions and automatic expiration?

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Microsoft Data Engineer Data Structures & Algorithms

A Microsoft data engineer needs to count unique users from a high-volume, real-time event stream. How would you choose and implement appropriate data structures for efficient, approximate cardinality estimation?

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LinkedIn Backend Developer Data Structures & Algorithms

When designing a social network feed, how would a backend developer at LinkedIn choose and implement data structures for efficient storage and retrieval of connections and posts?

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Airbnb Data Engineer Data Structures & Algorithms

How would an Airbnb Data Engineer select optimal data structures to process and query large-scale, real-time event data efficiently?

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Microsoft Mobile Developer Data Structures & Algorithms

Your Microsoft mobile application frequently displays complex, hierarchical data. How would a mobile developer choose and implement optimal data structures to ensure efficient navigation and updates?

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Mphasis Mobile Developer Data Structures & Algorithms

Your Mphasis mobile application displays a large, frequently updated list of user-generated content. How would you choose and implement data structures to ensure smooth scrolling and fast filtering/searching for this list?

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Tech Mahindra Data Engineer Data Structures & Algorithms

How would you choose the optimal data structure for real-time analytics on a high-velocity data stream?

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Uber Data Engineer Data Structures & Algorithms

When would you use a Merkle Tree in a data pipeline, and what benefits does it provide for data integrity?

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Deloitte Data Engineer Data Structures & Algorithms

Explain the HyperLogLog algorithm, and how would a data engineer use it to estimate unique counts for massive datasets?

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ServiceNow Mobile Developer Data Structures & Algorithms

When would you use a Trie data structure in a mobile application, and how does it optimize for predictive search or autocomplete features?

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